I recorded this bizarre bird singing in the woods late in the evening. It's an amazing mixture of sounds, including what sounds like a mobile phone and a lorry reversing. I think it's a thrush but I'm really not sure:
(46 second clip, with the silent sections removed, background noise removed, and the different sectioned normalised so that all sounds are roughly the same level of loudness)
You know what I'm going to do now; slow it right down.
At 16% of pitch and tempo it becomes something quite new, and quite disturbing I think. At 4 minutes and 6 seconds it's rather long, but stick with it if you can because each section is different and the effect is cumulative...